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        </div><article class="page single"><h1 class="single-title animated flipInX">Spring源码 - 声明式事务注解@Transaction的解析原理</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="https://wlizhi.cc" title="Author" target="_blank" rel="noopener noreffer author" class="author"><i class="fas fa-user-circle fa-fw"></i>Wlizhi</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/spring/"><i class="far fa-folder fa-fw"></i>spring</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2020-12-07">2020-12-07</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 1897 字&nbsp;
                <i class="far fa-clock fa-fw"></i>&nbsp;预计阅读 4 分钟&nbsp;<span id="/posts/spring/18-transaction-source-ano-supports/" class="leancloud_visitors" data-flag-title="Spring源码 - 声明式事务注解@Transaction的解析原理">
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            </div><div class="content" id="content"><p>spring源码系列文章，示例代码的中文注释，均是 copy 自 <a href="https://gitee.com/wlizhi/spring-framework" target="_blank" rel="noopener noreffer">https://gitee.com/wlizhi/spring-framework</a> 。</p>
<p>链接中源码是作者从 github 下载，并以自身理解对核心流程及主要节点做了详细的中文注释。</p>
<hr>
<p>[<a href="/posts/spring/17-transaction-source-process/" rel="">17 声明式事务执行流程源码分析</a>] 中已经列举，通过 getTransactionAttribute() 获取到了方法上事务注解的一些信息。</p>
<p>来到其源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractFallbackTransactionAttributeSource</span> <span class="kd">implements</span> <span class="n">TransactionAttributeSource</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">public</span> <span class="n">TransactionAttribute</span> <span class="nf">getTransactionAttribute</span><span class="o">(</span><span class="n">Method</span> <span class="n">method</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">targetClass</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 获取事务注解属性
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">method</span><span class="o">.</span><span class="na">getDeclaringClass</span><span class="o">()</span> <span class="o">==</span> <span class="n">Object</span><span class="o">.</span><span class="na">class</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// 先从缓存中拿。如果一个方法的事务注解信息被获取过，就会将其缓存到一个并发安全的map中。后面再获取就从这个缓存中获取。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// First, see if we have a cached value.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Object</span> <span class="n">cacheKey</span> <span class="o">=</span> <span class="n">getCacheKey</span><span class="o">(</span><span class="n">method</span><span class="o">,</span> <span class="n">targetClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">TransactionAttribute</span> <span class="n">cached</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="na">attributeCache</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="n">cacheKey</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">cached</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// 省略...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="o">}</span><span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// TODO 获取事务注解属性，放入缓存。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="c1">// We need to work it out.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">TransactionAttribute</span> <span class="n">txAttr</span> <span class="o">=</span> <span class="n">computeTransactionAttribute</span><span class="o">(</span><span class="n">method</span><span class="o">,</span> <span class="n">targetClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// Put it in the cache.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">if</span> <span class="o">(</span><span class="n">txAttr</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span><span class="c1">// 放入缓存
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="k">this</span><span class="o">.</span><span class="na">attributeCache</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">cacheKey</span><span class="o">,</span> <span class="n">NULL_TRANSACTION_ATTRIBUTE</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="n">String</span> <span class="n">methodIdentification</span> <span class="o">=</span> <span class="n">ClassUtils</span><span class="o">.</span><span class="na">getQualifiedMethodName</span><span class="o">(</span><span class="n">method</span><span class="o">,</span> <span class="n">targetClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">				<span class="c1">// 省略...
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>				<span class="k">this</span><span class="o">.</span><span class="na">attributeCache</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="n">cacheKey</span><span class="o">,</span> <span class="n">txAttr</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="n">txAttr</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>先从缓存中获取，如果可以获取到直接返回。否则调用 computeTransactionAttribute() 从方法上进行事务注解信息的获取。</p>
<p>来到 computeTransactionAttribute() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">AbstractFallbackTransactionAttributeSource</span> <span class="kd">implements</span> <span class="n">TransactionAttributeSource</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="n">TransactionAttribute</span> <span class="nf">computeTransactionAttribute</span><span class="o">(</span><span class="n">Method</span> <span class="n">method</span><span class="o">,</span> <span class="nd">@Nullable</span> <span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">targetClass</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// Don&#39;t allow no-public methods as required.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">allowPublicMethodsOnly</span><span class="o">()</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">Modifier</span><span class="o">.</span><span class="na">isPublic</span><span class="o">(</span><span class="n">method</span><span class="o">.</span><span class="na">getModifiers</span><span class="o">()))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// The method may be on an interface, but we need attributes from the target class.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// If the target class is null, the method will be unchanged.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Method</span> <span class="n">specificMethod</span> <span class="o">=</span> <span class="n">AopUtils</span><span class="o">.</span><span class="na">getMostSpecificMethod</span><span class="o">(</span><span class="n">method</span><span class="o">,</span> <span class="n">targetClass</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// TODO 重点：查找事务属性，首先从目标方法上查找
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// First try is the method in the target class.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">TransactionAttribute</span> <span class="n">txAttr</span> <span class="o">=</span> <span class="n">findTransactionAttribute</span><span class="o">(</span><span class="n">specificMethod</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">txAttr</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="n">txAttr</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 如果目标方法上查找不到，从目标类上查找。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// Second try is the transaction attribute on the target class.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">txAttr</span> <span class="o">=</span> <span class="n">findTransactionAttribute</span><span class="o">(</span><span class="n">specificMethod</span><span class="o">.</span><span class="na">getDeclaringClass</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">txAttr</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="n">ClassUtils</span><span class="o">.</span><span class="na">isUserLevelMethod</span><span class="o">(</span><span class="n">method</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="n">txAttr</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 如果方法上找不到，到接口方法、接口上找对应注解。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">if</span> <span class="o">(</span><span class="n">specificMethod</span> <span class="o">!=</span> <span class="n">method</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// Fallback is to look at the original method.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">txAttr</span> <span class="o">=</span> <span class="n">findTransactionAttribute</span><span class="o">(</span><span class="n">method</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">txAttr</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">return</span> <span class="n">txAttr</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// Last fallback is the class of the original method.
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="n">txAttr</span> <span class="o">=</span> <span class="n">findTransactionAttribute</span><span class="o">(</span><span class="n">method</span><span class="o">.</span><span class="na">getDeclaringClass</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">txAttr</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="n">ClassUtils</span><span class="o">.</span><span class="na">isUserLevelMethod</span><span class="o">(</span><span class="n">method</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">return</span> <span class="n">txAttr</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>查找注解信息的顺序：</p>
<ol>
<li>从缓存中获取，如果获取得到，就返回。</li>
<li>从目标对象的方法上找，如果能查找到注解信息，就返回。</li>
<li>从目标对象类上查找注解信息，如果查找到，就返回。</li>
<li>从目标接口、父类方法上查找注解信息，如果查找到，就返回。</li>
<li>从目标接口、父类上查找注解信息，如果查找到，就返回。</li>
<li>如果没有查找到注解信息，就返回null。</li>
</ol>
<p>继续向下追踪源码就能看到，无论是从方法上获取、还是从类上获取注解信息，最终都是调用到 determineTransactionAttribute()。</p>
<p>源码如下：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">AnnotationTransactionAttributeSource</span> <span class="kd">extends</span> <span class="n">AbstractFallbackTransactionAttributeSource</span>
</span></span><span class="line"><span class="cl">		<span class="kd">implements</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="kd">protected</span> <span class="n">TransactionAttribute</span> <span class="nf">determineTransactionAttribute</span><span class="o">(</span><span class="n">AnnotatedElement</span> <span class="n">element</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// TODO 循环所有的解析器，如果有解析器解析出的结果不为空，则直接返回事务属性，解析器列表是在当前对象构造函数时，加载的
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">//  如果是注解方式，用到的注解解析器是：SpringTransactionAnnotationParser
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="k">for</span> <span class="o">(</span><span class="n">TransactionAnnotationParser</span> <span class="n">annotationParser</span> <span class="o">:</span> <span class="k">this</span><span class="o">.</span><span class="na">annotationParsers</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">TransactionAttribute</span> <span class="n">attr</span> <span class="o">=</span> <span class="n">annotationParser</span><span class="o">.</span><span class="na">parseTransactionAnnotation</span><span class="o">(</span><span class="n">element</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">			<span class="k">if</span> <span class="o">(</span><span class="n">attr</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">				<span class="k">return</span> <span class="n">attr</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">			<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>遍历 annotationParsers，并调用 preTransactionAnnotation()，在 [<a href="/posts/spring/14-transaction-xml-annotation-registry/#AnnotationTransactionAttributeSource" rel="">14 声明式事务中XML配置及注解方式的注册入口</a>]
中已经说明，在事务注解支持的入口，注册了 AnnotationTransactionAttributeSource，其中封装了一个解析类 SpringTransactionAnnotationParser，这个类就负责事务注解的解析。</p>
<p>SpringTransactionAnnotationParser 是 TransactionAnnotationParser 的其中一个实现。</p>
<p>以下是 SpringTransactionAnnotationParser.parseTransactionAnnotation() 源码：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">SpringTransactionAnnotationParser</span> <span class="kd">implements</span> <span class="n">TransactionAnnotationParser</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">	<span class="nd">@Nullable</span>
</span></span><span class="line"><span class="cl">	<span class="kd">public</span> <span class="n">TransactionAttribute</span> <span class="nf">parseTransactionAnnotation</span><span class="o">(</span><span class="n">AnnotatedElement</span> <span class="n">element</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="c1">// TODO 重点：从方法上查找@Transactional注解，AnnotatedElement是Method、Field的超类
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">AnnotationAttributes</span> <span class="n">attributes</span> <span class="o">=</span> <span class="n">AnnotatedElementUtils</span><span class="o">.</span><span class="na">findMergedAnnotationAttributes</span><span class="o">(</span>
</span></span><span class="line"><span class="cl">				<span class="n">element</span><span class="o">,</span> <span class="n">Transactional</span><span class="o">.</span><span class="na">class</span><span class="o">,</span> <span class="kc">false</span><span class="o">,</span> <span class="kc">false</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="k">if</span> <span class="o">(</span><span class="n">attributes</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="c1">// TODO 重点：如果从方法上查找到了@Transactional注解，则解析注解中的各个属性值
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>			<span class="k">return</span> <span class="n">parseTransactionAnnotation</span><span class="o">(</span><span class="n">attributes</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="k">return</span> <span class="kc">null</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>AnnotatedElement是 Method、Class的共同父类，是一个接口。</p>
<p>上面源码中，首先从方法、或者类上查找 @Transactional 注解，如果查找到，调用 parseTransactionAnnotation()，进行解析封装。</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">class</span> <span class="nc">SpringTransactionAnnotationParser</span> <span class="kd">implements</span> <span class="n">TransactionAnnotationParser</span><span class="o">,</span> <span class="n">Serializable</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">	<span class="kd">protected</span> <span class="n">TransactionAttribute</span> <span class="nf">parseTransactionAnnotation</span><span class="o">(</span><span class="n">AnnotationAttributes</span> <span class="n">attributes</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// TODO 此方法主要做对象类型转换，将AnnotationAttributes中的属性赋值到RuleBasedTransactionAttribute中，返回。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">RuleBasedTransactionAttribute</span> <span class="n">rbta</span> <span class="o">=</span> <span class="k">new</span> <span class="n">RuleBasedTransactionAttribute</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 解析 @Transactional 中的属性：propagation、isolation、timeout、readOnly、value。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="c1">// 解析后将其封装到 RuleBasedTransactionAttribute 对象中。
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>		<span class="n">Propagation</span> <span class="n">propagation</span> <span class="o">=</span> <span class="n">attributes</span><span class="o">.</span><span class="na">getEnum</span><span class="o">(</span><span class="s">&#34;propagation&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">rbta</span><span class="o">.</span><span class="na">setPropagationBehavior</span><span class="o">(</span><span class="n">propagation</span><span class="o">.</span><span class="na">value</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="n">Isolation</span> <span class="n">isolation</span> <span class="o">=</span> <span class="n">attributes</span><span class="o">.</span><span class="na">getEnum</span><span class="o">(</span><span class="s">&#34;isolation&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">		<span class="n">rbta</span><span class="o">.</span><span class="na">setIsolationLevel</span><span class="o">(</span><span class="n">isolation</span><span class="o">.</span><span class="na">value</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="n">rbta</span><span class="o">.</span><span class="na">setTimeout</span><span class="o">(</span><span class="n">attributes</span><span class="o">.</span><span class="na">getNumber</span><span class="o">(</span><span class="s">&#34;timeout&#34;</span><span class="o">).</span><span class="na">intValue</span><span class="o">());</span>
</span></span><span class="line"><span class="cl">		<span class="n">rbta</span><span class="o">.</span><span class="na">setReadOnly</span><span class="o">(</span><span class="n">attributes</span><span class="o">.</span><span class="na">getBoolean</span><span class="o">(</span><span class="s">&#34;readOnly&#34;</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="n">rbta</span><span class="o">.</span><span class="na">setQualifier</span><span class="o">(</span><span class="n">attributes</span><span class="o">.</span><span class="na">getString</span><span class="o">(</span><span class="s">&#34;value&#34;</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="n">List</span><span class="o">&lt;</span><span class="n">RollbackRuleAttribute</span><span class="o">&gt;</span> <span class="n">rollbackRules</span> <span class="o">=</span> <span class="k">new</span> <span class="n">ArrayList</span><span class="o">&lt;&gt;();</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">rbRule</span> <span class="o">:</span> <span class="n">attributes</span><span class="o">.</span><span class="na">getClassArray</span><span class="o">(</span><span class="s">&#34;rollbackFor&#34;</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">rollbackRules</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="k">new</span> <span class="n">RollbackRuleAttribute</span><span class="o">(</span><span class="n">rbRule</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">rbRule</span> <span class="o">:</span> <span class="n">attributes</span><span class="o">.</span><span class="na">getStringArray</span><span class="o">(</span><span class="s">&#34;rollbackForClassName&#34;</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">rollbackRules</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="k">new</span> <span class="n">RollbackRuleAttribute</span><span class="o">(</span><span class="n">rbRule</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">Class</span><span class="o">&lt;?&gt;</span> <span class="n">rbRule</span> <span class="o">:</span> <span class="n">attributes</span><span class="o">.</span><span class="na">getClassArray</span><span class="o">(</span><span class="s">&#34;noRollbackFor&#34;</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">rollbackRules</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="k">new</span> <span class="n">NoRollbackRuleAttribute</span><span class="o">(</span><span class="n">rbRule</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="k">for</span> <span class="o">(</span><span class="n">String</span> <span class="n">rbRule</span> <span class="o">:</span> <span class="n">attributes</span><span class="o">.</span><span class="na">getStringArray</span><span class="o">(</span><span class="s">&#34;noRollbackForClassName&#34;</span><span class="o">))</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">			<span class="n">rollbackRules</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="k">new</span> <span class="n">NoRollbackRuleAttribute</span><span class="o">(</span><span class="n">rbRule</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">		<span class="o">}</span>
</span></span><span class="line"><span class="cl">		<span class="n">rbta</span><span class="o">.</span><span class="na">setRollbackRules</span><span class="o">(</span><span class="n">rollbackRules</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">
</span></span><span class="line"><span class="cl">		<span class="k">return</span> <span class="n">rbta</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">	<span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>创建一个 RuleBasedTransactionAttribute，依次解析注解中 propagation、isolation、timeout、readOnly、value 等属性，将其封装到 RuleBasedTransactionAttribute 中返回。</p>
<p>最终返回后，会放入到 attributeCache 中，后面在获取，就会从缓存中获取。</p></div>

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